Operations Manual, HPA2, Compact Outdoor SSPA 208495 REV B 125
To check the status of SSPA faults and conditions, the Host PC sends the following Request
String:
Byte Position Byte Value (Hex) Description
1 AA Frame Sync Byte 1
2 55 Frame Sync Byte 2
3 5 Destination Address of Compact Outdoor SSPA
4 A Source Address of PC sending Request String
5 0 Protocol Version Compatibility Field must always be 0
6 6F Request ID byte is set by originator, will be echoed back by respondent
7 1 Command “Get request” designator
8 3 Data tag “3” indicates access to SSPA Conditions
9 1 Data address 1 indicates access to the beginning of the Conditions table
10 12 Data length is 18 byte (entire length of Conditions table)
11 95 Arithmetic checksum of bytes 3 to 10
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